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MARKETABLE SECURITIES - Net realized gains (losses) and reclassification (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
MARKETABLE SECURITIES        
Net realized gain (loss) $ 0 $ (1) $ 4 $ (20)
Reclassification of net realized gains from other comprehensive income $ 0 $ (1) $ 4 $ (20)